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可延性
这里包括三个方面含义：
1、产品寿命。大致可以保证所选择的PLC的使用年限，尽量购买生产日期较近的产品；
2、产品连续性。生产厂家对PLC产品的不断开发升级是否向下兼容，这决定是否有利于现系统对将来新增加功能的应用。
3、产品的更新周期。当某一种型号PLC（或PLC模块）被淘汰后，生产厂家是否能够保证有足够的备品（或备件）。这时应考虑选择当时比较新型的PLC。
七、售后服务与技术支持
1、选择好的公司产品；
2、选择信誉好的代理商；
Square D QOB220 circuit breaker 2p 20amp type QOB
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SQUARE D Circuit Breaker QOU210 10 A 2 Poles NEW $54.75
SQUARE D CIRCUIT BREAKER 20 AMP SHIPPING 6.00 ANY AMOUN
Square D Circuit Breaker, 3 Pole, 30A, 240V, HACR, QO
Square D Circuit Breaker, 3 Pole, 20A, 240V, HACR, QO
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Square-D 8-Pole Lighting CONTACTOR 8903LO80 120v 30A
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SQUARE-D #XO-115 CIRCUIT BREAKER 1/2" WIDE R2/S3
EUC~Square D QO120GFI 20 Amp 120V 1 Pole QO Q0 GFCI GFI
Square D HJ100 Power Pact Circuit Protector-HJL36100M73
NEW Square D Control Relay Class 8501Type LO-40 #1615
Square D 15Amp 480 Vac 3 Pole
SQUARE D 30 AMP DOUBLE POLE BREAKER BRAND NEW QO230
